A corpora



Patented Mar. 22, 1927.

UNITED ST'E'ES PATENT OFFICE.

ARTHUR C. ROWLEY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO GLOBE AUTO- MATIC SPRINKLER GOMFANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TIQN OF PENNSYLVANIA.

Application filed May 27,

One object of this invention is to provide a novel form of temperature-responsive link particularly designed for use in connecting the movable parts of automatic sprinklers or normally holding together the two parts of a chain or rope so that these shall be automatically disconnected when the link is subjected to predetermined abnormal temperature.

The invention further contemplates a simple, structurally strong form of fusible link including two interchangeable elements of identical construction particularly designed to sustain for long periods of time a predetermined tensile stress, without likelihood of their slippage or separation while at the same time being free to permit such separation to occur whenever the temperature in their vicinity rises to a predetermined oint.

I further desire to provide a fusible link of the above noted type with elements whose cooperating faces include portions of novel form particularly designed to impart to the assembled link the above noted desirable characteristics while facilitating the separation of the parts of said link when the fusible metal normally connecting them shall. have been sufficiently softened or fused.

These objects and other advantageous ends I attain as hereinafter set forth, reference being had to the accompanying drawings, in which,

Fig. 1 is a plan of afusible hnk constructed in accordance with my invention;

Fig. 2 is a longitudinal vertical section on the line 22, Fig. 1;

Figs. 8 and 4 are fragmentary elevations of the cooperating parts of the two link elemen'ts;

Fig. 5 is an end elevation of the structure shown in Fig. 3;

Figs. 6 and 7 are vertical sections on the lines 6-6 and 77 of Figs. 3 and 4 respectively; and

Fig. 8 is a plan of a slightly modified form of fusible link.

In the above drawings 11 represent a pair of generally flat, elongated metallic plates, each of which has one end of more or less circular outline and provided with a perforation 2. By suitable means the edges of this perforation, which is preferably circular, are thickened to form annular ribs 3 projecting from both plane faces of FUSIBLE LINK.

1922. Serial No. 564,260.

the element. Beyond this eyelet each plate laterally flared to a maximum width and 1s thereafter contracted to a width substantialy that which it has adjacent said eye.

face of the other element so that said two elements will be spaced a definite distance apart so as to receive the solder or other relatively fusible metal whereby said elements are normally connected.

At substantially the middle of that end of each link distant from the opening 2, the metal of each plate is displaced so as to form in one face thereof an elongated de pression extending in the central longitudinal line and the opposite face of the plate 1s correspondingly bulged or forced out so that there is formed a longitudinally eX- tending projection 5 substantially U-shaped 1n crosssection. In the body of each plate adjacent its perforation 2, and like the pro jection 5, disposed symmetrically with re gard to its longitudinal center line, there is formed an opening 6 having two parallel sides and formed with its end adjacent the perforation 2 at right angles to said sides. Its second end is preferably given a semicircular curvature and is formed with a curved lip 7 extending from its otherwise plane surface on that side thereof opposite the projection 5.

The dimensions of this opening 6 and the form of the inner surface of the lip 7 are such that the projection 5 of a second identically formed plate will more or less snugly fit into and cooperate therewith when the two plates are superposed, as shown in Figs. 1 and 2, the projection 5 of each plate extending into the opening 6 of the other plate and the body portions of the two plates lying parallel with each other, as shown in the drawings, but spaced apart a predetermined distance dependent upon the dimen sions of the projections 4.

Each of the projections 5 of one plate is so curved or formed as to conform to the curvature of the lip 7 of the other plate so that when the two plates are connected by solder or other relatively fusible metal, any tensile stress which may be applied by suit-- able elements inserted in the openings 2 is for the most part transmitted from one plate to the other through their lips 7 and coact- March 22, 1927. 1,622,055

T. N. RUSSELL UNCOUPLING DEVICE FOR COUPLINGS Filed Nov. 14, 1922 

